"Ignoring depression during pregnancy can be risky for both mother and child. Depressed women often take poor care of themselves. They may smoke, drink to excess, or neglect proper diet. And some research suggests that depression in pregnant women can have direct effects on the fetus. Their babies are often irritable and lethargic, with irregular sleep habits. These newborns may grow into infants who are underweight, slow learners, and emotionally unresponsive, with behavior problems such as aggression. "
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http://www.health.harvard.edu/newsweek/Depression_During_Pregnancy_and_After.htm